Sylvania



(Nd Model.)

'J. H. McINDOE & W. MEREDITH.

'EXHAU'ST NOZZLE. No. 396,168. Patented Jan. 15, 1889.

WITNESSES: J I l/VI/E/VT R:

ATTORNEYS.

N PETERS, Phmn-Lithogngher, Walhillginn. 04C- UNITED STATES PATENT OFICE.

JoIIN II. McINDoE AND WILLIAM MEREDITH, or MOUNT PLEASANT, PENN-SYLVANIA.

EXHAUST-NOZZLE.

SPECIFICATION forming part of Letters Patent No. 396,168, dated January15, 1889.

Application filed August 17, 1888. Serial No. 282,983. (No model.)

To all whom it may concern:

Be it known that we, JOHN H. MCINDOE and WILLIAM MER DITH, both of MountPleasant, in the county of Vestmoreland and State of 5 Pennsylvania,have invented a new and useful Improvement in Exhaust-Nozzles forLocomotive and other Engines, of which the following is a full, clear,and exact description. This invention is specially adapted for I engineswhich exhaust into a smoke box or stack-such as locomotive-engines; andit relates to exhaust-nozzles provided with a sliding block or blocksfor increasing and diminishin the draft by regulating the area of the Iorifices through which the exhaust-steam of the engine passes into thesmoke box or stack.

The invention consists in a novel construction of such adjustablenozzles, substantially as hereinafter described, and pointed out in theclaim, and whereby the sliding block used to control the capacity andtop opening of the nozzle does not when fully adjusted inward contractor lap over the opening below it to bafiie the escaping steam in theexhaust-chan- 2 5 nel, but insures a free or uninterrupted dischargefrom the channel through the nozzle.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 represents a plan view of the improvement as applied or adaptedto a locomotive-engine,the boiler of which is shown partly in section;and Fig. 2 is a sectional side ele- 3 5 vation of the same upon the linea: 50 in Fig. 1.

. The improvementas illustrated in the drawings is supposed to beapplied to locomotiveengines which exhaust into the usual channels,

A, terminating inside of the smoke-arch of the locomotive-boiler B,directly below the smoke-stack 0. Each channel A connects with anexhaust-nozzle, D, set on top of the channels A in the seat S, carryingthe nozzle, and having an enlarged base opening, 6,

through it corresponding to the opening of the exhaust-channel A, withwhich it registers.

The two nozzles D are preferably made in one piece, as shown, and eachnozzle is provided with a slide or sliding block, F or F, re- 5spectively, and the two blocks united with each other at their outerends by a crosspiece, I). Said block F or F virtually forms a slidingpart of the nozzle, extending from the top down to near the bottom onthe side thereof, and is constructed at its inner end to 5 5 form acircular tapering side to the nozzleorifice corresponding to theopposite wall of the orifice in the fixed part of the nozzle, and

so that when the sliding block is adjusted to, its full extent inward,as shown in Fig. 2, a nozzle-orifice of conical shape will be formed inline at its base, with the opening in the channel A leading thereto andof greater area at its bottom than at the top of the nozzle. 7

Secured to the cross-piece b of the slide or sliding blocks F F is arod, 0, which is extended to the cab of the locomotive and connectedwith a suitable lever under control of the engineer.

\Vhen the sliding block F or F is adjusted to its innermost position, asshown in Fig. 2, then the top opening of the nozzle D is round; but whenit is drawn out, as shown in Fig. 1, then the top Opening of the nozzleis elongated and considerably enlarged, so that the ex- 7 5 haust-steamcan freely pass out of the nozzle or nozzles D, and thereby prevent anybackpressure in the cylinder or cylinders of the engine; but in everycase it will be noticed that the sliding block F or F, even when.adjusted to its fullest extent inward, presents no lower surface for theescapii'ig steam to v strike, and does not out off the discharge throughthe opening in the exhaust-channel A or in the base portion of thenozzle-orifice which registers with its respective channel A, thus doingaway with all baffling of the steam in said channel. This is importantand makes the adjustable nozzle a practical and useful device; and itshould here be observed that, 0 the nozzle-orifice being a taperingone,largest at its base, the drawing outward of the sliding block F or Fwill still keep the upper end of the nozzle-orifice smaller than itslower one. The sliding-block portion of thenozzle may be arrested at theextremity of its inward stroke by coming in contact with a shoulder,

(Z, on the fixed inner wall of the nozzle when the orifice up throughthe nozzleassumesits conical form, free from any interception by too ingoil? steam, the engineer can, before reachthe sliding block of theopening beneath the latter.

The general uses of the device may be briefly stated as follows: \Vhenthe engineer starts a heavy train, he draws out the sliding block orblocks F F, 't'ully opening the exhaust, so that the engines workwithoutbaekpressure; but after the engine has got headway he contractsthe exhaust by shutting in the slidin blocks, and this will make astrong draft and make all the steam that is required, after whieh,if toomuch steamis being made, he again opens the exhaust and checks thedraft. In case of leaky boiler-fines, too, he can contractthe exhaustand keep the tines clear of dirt by quickeuing the draft; or, again,when an engine is standing, instead of resorting to the annoyingexpedient of blow- 1 ing the stoppingplace, open the exhaust and letthefire go down. Likewise, when passing through a town, the engine can bemade to exhaust free or lightly, thus doing away with objectionablenoise and checking the escape of sparks, which often causeeonfiagrations.

:In fine, as the engineer can increase or diminish the opening of theexhaust-nozzles D, and

as this controls the draft, the exhaust-steam,

lire and the steam in the boiler as desired; but all or most of theseresults wouldbe coun-,

teraeted or at least be seriously aitected were the steam to be battledin the exhaust-chair nel leading to the nozzle or in the exhaustnozzleitself by the closing action of the slide or slidingnblock to contractthe exhaust, and

which our impriwed construction of the adjustable nozzle avoids by thesliding block at its inner end always being exterior to or in line withthe opening below it and never crossing said opening.

Of course the invention is equally applicable to a single as to a doublenozzle connecting with a single or double exhaust-channel; and it willin no wise change the invention to make the top opening of the nozzle,when the sliding block h or 1* is adjusted to its innermost position, ofa square shape instead of round, as shown.

Having thus described our invention, what we claimas new, and desire tosecure by 'Letters Patent, 'is- The combimrtion, with the seat S, havingan exhaust channel, A, forming an opening through it, of theinternally-ta jlering or conical nozzle D, arranged over said seat andpro vided in the fixed portion of its base with an opening, 6, of aslarge area as the channelopening througl'i said seat, with which itregisters, and the sliding block F or F, of tapering construction, onits inner end, fitted to slide at its base up to, subject to the action.ot',a stop, and away from or back of said open'ii'ig 6 withoutoverlapping it, whereby said sliding block when i moved in or out not.only operates to increase or diminish the top opening of the nozzle, butwhen fully adjusted inward does not contact said opening (2, and bathingot the steam in the exhaustehannel is avoided, substi'intially asspecified.

JOHN H. MGI'NDOE. \VILLIAM MEREDl'lll.

Witnesses:

WILLIAM llrrcncock, JAMES H. MURDoCH.

